ML 811K1

3-way-coaxial-loudspeaker with cardioid characteristic in bass range

With the ML811K1 a mastering loudspeaker was created combining maximal levels and absolute neutrality. 

Award: stereoplay GOLDENES OHR 2020 - 1st place

(shown veneer: rosewood nature)

ML 811K1


With the ML 811K1 a mastering loudspeaker was created combining maximal levels and absolute neutrality. For the first time mastering engineers have the opportunity to use a loudspeaker providing the same sound pattern Tonmeisters pledge to for decades. Special attention was directed to the necessities and conditions in mastering studios: large rooms and listening distances, high levels and timbral neutrality. Regardless of whether classical, rock, pop, or motion picture productions the ML 811K1 overcomes loud and quiet passages with ease. Also in big living rooms or home cinemas it convinces with the accustomed ME quality.

By the cardioid radiation characteristics within the frequency range from 30 Hz through 250 Hz the reflections on the back walls of listening rooms can be minimized. In addition the transfer characteristic can be matched to the acoustical conditions of the reproduction room as well as to the set-up situation by the parametric filters of the integrated DSP.

The directivity index of the monitor was optimized for long listening distances and a base distance between three and eight metres (9′10″ and 26′3″). For low frequencies a very linear 400 mm (16″) long-throw driver in a cardioid cabinet is employed, delivering excellent impulse fidelity. The four 25 mm (1″) dome tweeters are coaxially mounted in front of the 260 mm (10″) cone allowing a precise steering of the directivity index. As a result a realistic and steady spatial performance of the sound pattern around the listening position is achieved, with high homogeneity and smallest possible coloration. By the big diaphragm area the ML 811K1 is to the highest degree level proof while at the same time it has the lowest distortions. Therefore the ML 811K1 is a precision studio tool allowing fatigue free working for hours.

The RL-Amplifier is a 2 U rackmount Class-D amplifier driving the woofer with 1,500 W at 8 Ω and the midrange as well as the tweeters equally with 800 W at 4 Ω and therefore has sufficient power reserves for every situation.

A variety of special stands and racks is available as accessories. According fixing elements have been integrated into the loudspeaker cabinet.


Active three-way reference monitor for listening distances between 3 m (9′10″) and 8 m (26′3″)

Maximum SPL
from 100 Hz ... 6 kHz

118 dB ... 127 dB / r = 1 m (3′3″) (4 π)
121 dB ... 130 dB / r = 1 m (3′3″) (2 π)


28 Hz ... 20 kHz ± 3 dB

Acoustic output level / PE = - 14 dBu

95 dB / r = 2 m (6′7″)

Directivity index
from 100 Hz ... 10 kHz

increasing from 5 dB to 14 dB

Inherent noise sound level

≤ 7 dB (A) / r = 1 m (3′3″)

Total harmonic distortion
measured at 100 dB / r = 1 m (3′3″)
from 100 Hz ... 10 kHz

≤ - 45 dB

Nominal input level

+ 6 dBu (adjustable)

Input impedance

≥ 10 kΩ RC balanced

Electronic crossover frequencies

550 Hz und 2.1 kHz

Nominal output power of the amplifier

1,500 W / 8 Ω
800 W / 4 Ω
800 W / 4 Ω

Input connector of the speaker

Neutrik Speakon NL8 MPR

Input connector of the amplifier

Analogue XLR 3F; optional XLR 3F AES EBU

Output connector of the amplifier

Neutrik Speakon NL8 MPR

Loudspeaker systems

1x 400 mm (16″) cone
Mid-range unit
1x 260 mm (10″) cone
4x 25 mm (1″) dome

Operation indicator of the amplifier

Display blue

Level and clipping indicator

Green LED chain at amplifier / limiting red

Power requirements

85 V ... 265 V, 50 Hz ... 60 Hz

Power consumption

50 VA in standby
max. 1,100 VA at full load

Mains connection

Neutrik Powercon NAC3 MPA-1

Protection class

Protection class 1

EMV conformity

EN55103-1 Emission Class A
EN55103-2 Immunity

Temperature requirements

for use
+ 15°C ... + 35°C (59°F ... 95°F)
for storage
- 25°C ... + 45°C (- 13°F ... 113°F)
45 % ... 75 %

Connection cable
Loudspeaker - amplifier

Speakon NL8
Standard length 3 m (9′10″); optional other lengths

Dimensions (W × D × H)

460 mm × 400 mm × 810 mm (18.2″ × 15.8″ × 31.9″)
440 mm (faceplate 485 mm) × 290 mm × 90 mm (2 HE)
(17.4″ (faceplate 17.4″) × 11.5″ × 3.6″ (2 U))


51 kg (112.5 lbs)
7.1 kg (15.7 lbs)

Design of the cabinet

MDF wood in ash black veneered; optional different veneers or colours
with lateral mounting; optional without lateral mounting
with handles; optional without handles

Floor bracket stand ML811K1

  • Loudspeaker rotable mounted
  • Deliverable heights (Top edge loudspeaker): 1923 mm (75.7 in), 1713 mm (67.4 in), 1573 mm (61.9 in) and 1458 mm (57.4 in)
  • Base panel (W x D): 620 mm x 550 mm (24.4 in x 21.7 in)
  • Base panel and stabilisation panel veneered
  • Racks black powder-coated


  • Integrated cable duct in the pedestal
  • Height (Top edge loudspeaker): approx. 1.195 mm (47.05 in)
  • Base panel (W x D): 480 mm x 420 mm (18.9 in x 16.5 in)
  • Base panel veneered or satin matt varnish
  • Main pillar black powder-coated

Standard veneer ash black (RAL9005), optional veneers and optional colours

We offer our loudspeakers in standard veneer ash black (RAL9005) or for an additional charge in different optional veneers respectively optional colours. This website provides an overview on the optional veneer and lacquer styles. We are pleased to check if your desired individual veneer and colour can be realised.

Important information about deviations from sample pattern

Wood is a natural product. Even the most thorough manufacturing can result in deviations in colour or structure and is no cause for complaint.
Images are represented differently on every screen and hence not colour-proof.